Continuing Education for the Practical Structural Engineer
Analyze This: Structural Modeling Tips, Techniques and Pitfalls

Featuring Presentations by 4 Industry Experts
Thursday, May 23, 2019 | 8 a.m.-12:30 p.m.
4.0 SEAMASS-Certified PDHs or
4.0 NCSEA Diamond-Certified PDHs
Presentation Topics
Performance Based Design:
The Rational Method to Design for Hazards
Presented by:
Ali Ashrafi, Ph.D., PE, LEED AP BD+C - Associate Principal, Thornton Tomasetti

OVERVIEW: As structural engineers, we rely on guidance and instructions provided in building codes to design for structures that properly account for different hazards. The prescriptive design methods provided in codes typically define the exact characterization of the hazards for which we design, how to analyze the effects on the structure, and how to design the structure to sustain the effects of the hazard.

Performance based design (PBD) is an alternative to prescriptive design, allowing for a more rational design. PBD properly accounts for the hazard specific to a structure, considers the performance appropriate for the structure (serviceability, life safety, economic impact, post-hazard performance, etc.), and explores the most rational ways to achieve the target performance. Being a rational design method, PBD allows for achieving better performance at the same cost, or lower cost for the same performance, and provides additional confidence and knowledge regarding the expected behavior of a structure. This presentation will briefly discuss the what, why, and how of performance based design, with a discussion involving the more mature field of seismic performance based design, as well as the developing fields of fire, wind, and flood performance based design.

Common Modeling Errors
Presented by:
Alex Bonnar, PE - Senior Structural Analyst, McNamara Salvia

OVERVIEW: The presentation will cover a broad range of modeling errors, from analysis models that don’t run to models seem to behave themselves but need to be checked for undetected mistakes. Sources of modeling error are divided into typographical, object geometry, object assignment, software analysis and design assumptions, and software bugs. Each category of error will be discussed through examples with suggested best practices to avoid them and detection strategies. Examples come from building design using RAM Structural System and ETABS, but the lessons will be applicable to engineering analysis packages in general.

Static Soil-Structure Interaction of
Buried Pipes, Culverts and Buried Bridges
Presented by:
Mark Webb, Ph.D., M.S.C.E
Staff Consultant | Simpson Gumpertz & Heger

OVERVIEW: The presentation will focus on the fundamental principles of pipe behavior, soil behavior, and soil-structure interaction relating to buried structures. Industry standards for the design of buried pipes, culverts and buried bridges will be discussed. Next, unusual or complex installations requiring finite element analysis (FEA) will be discussed. Modeling tips, techniques and pitfalls including topics such as: incremental construction, soil and structural material models, linear vs non-linear material behavior, 2D vs 3D FEA, interface elements, strip footings, and compaction effects will be discussed. 

Approximate Methods
Presented by:
Richard Henige, Jr., PE, SE
Vice President | LeMessurier

See below for presenters' bios
Event Timing & Registration
WHEN:   Thursday, May 23, 8:00 a.m.-12:30 p.m. 
( Registration and Breakfast begins promptly at 7:30 a.m. )

The Kostas Research Institute at Northeastern University Innovation Campus, 141 South Bedford Street in Burlington MA. Directions  

PDHs:   4.0 SEAMASS-Certified or 4.0 NCSEA Diamond-Certified
Includes Continental Breakfast, and Lunch  
$125  Seminar + 4.0 SEAMASS-Certified PDHs 
$150 Seminar + 4.0 NCSEA Diamond-Certified PDHs
$100  Govt. and Bldg. Officials: Seminar + 4.0 PDHs 
$ 75 Seminar (no PDHs) 
$ 25 Students: Seminar (no PDHs) - Enrollment proof required  
$350 Event Sponsor Opportunity  
Seating is limited; Register Now to Reserve Your Spot    
Registration will close at room capacity or at Noon on Monday, May 20.
Event Sponsor
Helical Drilling is a geotechnical design/build contractor focused on providing innovative, efficient and adaptable geotechnical engineering and ground construction solutions to general contractors, owners and engineers throughout the Northeastern U.S.
Ali Ashrafi, Ph.D., PE, LEED AP BD+C
Associate Principal | Thornton Tomasetti
Dr. Ali Ashrafi is an Associate Principal at Thornton Tomasetti. He has more than 15 years of experience in structural design, renovation, investigation and demolition, seismic performance based design, fire performance based design, wind performance based design, advanced analytics, and nonlinear and dynamic analysis.

He has helped shape and define performance based design practice through his extensive publications as well as his work on numerous projects involving performance based design (for earthquakes, wind, and fire). Dr. Ashrafi is also an adjunct professor at Columbia University, teaching Earthquake and Wind Engineering.
 Alex Bonnar, PE
Senior Structural Analyst | McNamara Salvia
Alex Bonnar, P.E. received his Bachelor of Science in Civil Engineering from the University of Massachusetts Amherst in 2002 and his Master of Science in Structural Engineering from Northeastern University in 2004.

for the past 15 years he has worked as a structural engineer at McNamara Salvia in Boston. His current position is Senior Structural Analyst and spends his time analyzing and designing complex structures and performing in-house peer reviews of analysis models. As a constant resource to McNamara Salvia, Alex has also worked with Bentley & CSI to test and debug the analysis tools that we all use. 
Mark C. Webb, Ph.D., M.S.C.E
Staff Consultant | Simpson Gumpertz & Heger
Dr. Webb is a registered PE in South Africa and an ASCE Fellow.  He earned B Eng (Civil) and B Eng Honors degrees from the University of Pretoria, South Africa in 1992/1993, and Master's and Ph.D degrees in Geotechnical Engineering from the University of Massachusetts in 1996/1998. His focus areas include: Soil-structure-interaction; Finite element analysis of buried structures; Pipe and culvert structural design; Analysis, inspection and forensic investigations; Pressure pipeline condition assessment & integrity management; Design and installation of mine decline & stockpile tunnels and buried bridges; and Geotechnical, structural and hydraulic instrumentation. 
Dr. Webb co-developed a graphical software interface for FEA software developed for the design, analysis and evaluation of buried pipes, culverts and other soil-structure interaction systems, and played a key role in rewriting the AASHTO LRFD Bridge Design and Construction specifications for large-span metal and concrete culverts. He developed a Profile Measuring Device that is used to accurately measure the deflected shape and displacement of pipelines, tunnels and other round openings. Prior to joining SGH in 2018, he managed his consulting firm in South Africa for 20 years.
Richard Henige, Jr., PE, SE
Vice President | LeMessurier
Mr. Richard Henige is a Professional Engineer and Structural Engineer who has served as Vice President of LeMessurier since 1977. He has the rare talent of distilling the most complex problems to their base principles.

Capitalizing on this and his vast technical expertise, Richard has used his nearly four decades of experience at LeMessurier to hone his skills of analyzing specialty structures and earning vice chairmanships on seismic and stability design committees.
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